In the aftermath of the battle with their future selves, the crew, resurrected from the dead, due to time paradox's and Lister is depressed when he learns the curry supplies were destroyed in the battle. But all hell breaks loose yet again, when Lister uses Kryten's spare-head 'Spare Head 2' to take them back into time to get some curries from Earth. Only to change the assassination of President John F. Kennedy and create a alternate dimension.